Metal Oxide And Carbon Nanotube Composite Electrode Material For Supercapacitors

Supercapacitors,also known as electrochemical capacitors,as a new energy storage device gradually have been widely used,mainly used in the field of hybrid cars,mobile electronic devices,it has a higher energy density and power density,and rich in resources,good environment cycle performance,high-current charge and discharge,etc.Assembled supercapacitor can be divided into symmetric and asymmetric supercapacitor since asymmetric capacitor has a relatively wide potential window,that is the great energy density,it is widely used.According to the energy storage mode,ultracapacitors contains two kinds of capacitors electric double layer capacitor and the Faraday pseudo capacitors,electric double layer capacitor achieve energy storage between electrode/electrolyte interface surface electrostatic ion adsorption/desorption,while Faraday pseudo-capacitor fast reversible oxidation by utilizing ion electrolyte and the electrode material reduction reaction between the energy storage.Supercapacitor include an electrode material,the separator and the electrolyte,electrode material as the core of the super capacitor,become a research hotspot.Electrode materials generally include: carbon materials,metal oxides and conductive polymers thereof and diffraction.In this paper,the choice of carbon-based materials and metal oxide composite material as the electrode,because the metal oxide having a larger capacitance than the theory,but poor electrical conductivity,good cycle performance,and carbon-based materials(carbon nanotubes)have excellent electrical conductivity,large surface area,it will be a composite of two materials,the advantages of a collection of two materials,the use of hydrothermal synthesis of an electrochemical electrode materials with excellent performance,specific experiments are as follows:1.Hydrothermal method,by controlling the temperature of hot water,and thus may be different electrode materials synthesis morphology.Which lead to the synthesis of electrode materials with different morphologies in particular under alkaline conditions by a simple hydrothermal prepared nanostructured NiO\CNTs composites,nickel oxide nanosheets in the composite primarily for carbon nanotubes attached to the base effect provided by the morphology of the sample and found that carbon nanotubes were characterized by van der Waals force or ?-? bond successful adhere to the surface NiO nanoflowers.In addition,different hydrothermal temperature composites prepared by electrochemical performance testing,with 6 M KOH as electrolyte,a platinum electrode as the counter electrode,a saturated calomel electrode as the reference electrode,the active material for the working electrode,three-electrode under the test system,a constant current charge and discharge tests found NC-15(at a temperature of 150 ?)specific capacitance in a current density of 5 A g-1 Shi up to 2171 F g-1,CV after 1000 cycles,the capacity NC-15 composites retention rate of 92.8%,these excellent electrochemical properties of nickel oxide and carbon nanotubes described composite supercapacitor electrode material is a promising.2.The composite electrode material by-step hydrothermal synthesis NiO and different mass ratio of CNTs.Adding different amounts of CNTs,synthesized composite electrode material by the X-ray diffraction(XRD),scanning electron microscopy(SEM)and isothermal nitrogen adsorption-desorption(BET)and a series of characterization found only in NiO: CNTs = 1: 1,when,with the best degree of crystallinity,the best morphology,the largest surface area.Then tested by electrochemical three-electrode system,the result NC11 has the best electrochemical performance.In summary,in this paper,we synthesized composite whose synthesis process is simple to implement different morphology,this paper synthesized composite synthesis process is simple to implement different morphology,excellent electrochemical performance supercapacitor electrode materials,in addition,the paper chosen subject are abundant raw materials,low cost,environmentally friendly and carbon-based materials transition metal oxides.